Possible, Toasty, but he probably has it right saying it's the pipe from the water pump running through the valley to the back of the engine and it's associated hose connections. Too bad I've never done one, or I'd offer to help...not to mention, I have no garage.

Might want to post up in the Tech section for mo' better advice.

PC-12...turbine powered single with a tail so big a whole family can picnic in the shade under it...for the win.

Pilatus PC-12

John B.